目的 提高5182铝合金的耐蚀性能及与有机漆膜的结合力。方法 采用氟锆酸试剂与5182铝合金反应制备锆化膜，探究锆化液pH值、浸泡时间对锆化膜耐蚀性能的影响，并优化制膜工艺。采用SEM、EDS能谱仪及超薄切片仪分析锆化膜的微观结构和成分，结合SKPFM分析合金中第二相颗粒的电位对锆化膜形成机理的影响，采用EIS对锆化膜的耐蚀性能进行评价分析，采用涂层附着力自动划痕仪评价锆化涂层对巴斯夫有机漆膜结合力的影响。结果 制备锆化膜的最佳工艺为：pH=4.5，浸泡时间2.5 min。在5182铝合金表面制备了一层50~100 nm厚的锆化膜，且该锆化膜优先在阴极性的第二相颗粒上形成。EIS分析表明，在Na2B4O7×10H2O和NaOH水溶液中，锆化处理试样的低频阻抗值比未锆化处理试样高80 Ω。划痕测试表明，锆化处理试样与未锆化处理试样相比，其临界载荷提高了75%。结论 经过锆化最佳工艺处理后，5182铝合金的耐蚀性能提高，且锆化涂层作为中间层，能显著提高有机漆膜与合金基体的结合强度。

The work aims to improve corrosion resistance of 5182 aluminum alloy and adhesion of organicpaint film. Azirconium conversion coating was prepared on the alloy in H2ZrF6 solution. The effects of different immersion duration and pH value of the solution on corrosion resistance of the coating were investigated, and the process was optimized as well. Scanning electron microscope (SEM), energy dispersive X-Ray spectroscopy (EDS) and ultramicrotomy were used to analyze microstructure and composition of the zirconium conversion coating. Scanning Kelvin probe force microscope (SKPFM) was used to characterize surface potentials of intermetallic particles in the alloy substrate and analyze formation mechanism of the coating. EIS was used to evaluate and analyze corrosion resistance of the coating. Automatic scratch tester was employed to evaluate the effects of zirconium conversion coating on adhesion of BASF organic coating. Under the optimal process parameters (immersion duration of 2.5 min and solution pH of 4.5), a 50~100 nm thick conversion coating was prepared on the alloy substrate, which was preferentially formed on cathodic intermetallic particles. Electrochemical impedance spectroscopy (EIS) analysis indicated that, in the Na2B4O7×10H2O and NaOH solution, low frequency impedance of zirconium-treated sample was about 80 Ω higher than that of the un-treated sample. The scratch test showed that critical load of the zirconium-treated sample was 75% higher than that of the un-treated one. Corrosion resistance of 5182 aluminum alloy is improved after being treated in the optimal zirconium treatment process, and adhesion between organic coating and alloy substrate are significantly improved by zirconium conversion coating as intermediate layer.